Just use any kind of model, any kind of class, any kind of database that you need for your application. **FastAPI** has you covered with the dependency injection system.

## Code size { #code-size }

This example might seem verbose. Keep in mind that we are mixing security, data models, utility functions and *path operations* in the same file.

But here's the key point.

    val inflater = MessageInflater(false)

    val goldenValue = "Hello deflate!".repeat(100).encodeUtf8()

    val deflated = deflater.deflate(goldenValue)
    assertThat(deflated.size).isLessThan(goldenValue.size)
    val inflated = inflater.inflate(deflated)

    assertThat(inflated).isEqualTo(goldenValue)
  }

  @Test fun `inflate deflate empty message`() {
    val deflater = MessageDeflater(false)

  @Param({"20", "2000"})
  int size;

  @Param({"2", "20"})
  int nonAlphaRatio; // one non-alpha char per this many chars

  @Param boolean noWorkToDo;

  Random random;
  String testString;

  @BeforeExperiment
  void setUp() {
    random = new Random(0xdeadbeef); // fix the seed so results are comparable across runs

    int nonAlpha = size / nonAlphaRatio;
    int alpha = size - nonAlpha;

            int channelsToCreate = Math.min(maxChannels, Math.min(serverAddresses.size(), availableInterfaces.size()));
            log.debug("Creating {} channels for session {}", channelsToCreate, sessionId);

            for (int i = 0; i < channelsToCreate && i < availableInterfaces.size() && i < serverAddresses.size(); i++) {
                try {
                    NetworkInterface netInterface = availableInterfaces.get(i);

     * @return string representation of this FacetInfo instance
     */
    @Override
    public String toString() {
        return "FacetInfo [field=" + Arrays.toString(field) + ", query=" + Arrays.toString(query) + ", size=" + size + ", minDocCount="
                + minDocCount + ", sort=" + sort + ", missing=" + missing + "]";
    }

      val trustedCert = trustRootIndex.findByIssuerAndSignature(toVerify)
      if (trustedCert != null) {
        if (result.size > 1 || toVerify != trustedCert) {
          result.add(trustedCert)
        }
        if (verifySignature(trustedCert, trustedCert, result.size - 2)) {
          return result // The self-signed cert is a root CA. We're done.
        }
        foundTrustedCertificate = true
        continue

  @Param({"20", "2000"})
  int size;

  @Param({"2", "20"})
  int nonAlphaRatio; // one non-alpha char per this many chars

  @Param boolean noWorkToDo;

  Random random;
  String testString;

  @BeforeExperiment
  void setUp() {
    random = new Random(0xdeadbeef); // fix the seed so results are comparable across runs

    int nonAlpha = size / nonAlphaRatio;
    int alpha = size - nonAlpha;

    assertNull(map.getInstance(Integer.class));
    assertEquals(2, map.size());
  }

  public void testParameterizedType() {
    TypeToken<ImmutableList<Integer>> type = new TypeToken<ImmutableList<Integer>>() {};
    map.putInstance(type, ImmutableList.of(1));
    assertEquals(1, map.size());
    assertEquals(ImmutableList.of(1), map.getInstance(type));
  }

			// ram_per_request is (1MiB+32KiB) * driveCount \
			//    + 2 * 10MiB (default erasure block size v1) + 2 * 1MiB (default erasure block size v2)
			apiRequestsMaxPerNode = int(maxMem / uint64(maxSetDrives*blockSize+int(blockSizeV1*2+blockSizeV2*2)))
		} else {
			// ram_per_request is (1MiB+32KiB) * driveCount \
			//    + 2 * 1MiB (default erasure block size v2)
			apiRequestsMaxPerNode = int(maxMem / uint64(maxSetDrives*blockSize+int(blockSizeV2*2)))

You can import it directly from `fastapi`:

```python
from fastapi import UploadFile
```

::: fastapi.UploadFile
    options:
        members:
            - file
            - filename
            - size
            - headers
            - content_type
            - read
            - write
            - seek